Just checking to see what yall think would be the cause of the issue that I'm having with my 2 8 foot blades. When I fully extend them all the way down and they either do not hit bottom and I go to bring them back up sometimes they do not come back up unless I get into shallow water and pull forward at the same time. My pumps are running but it almost seems like they are not strong enough to bring it back up sometimes. Is there some sort of screen inside the pumps that could be partially stopped up or do the pumps just get weak over time?